Open3 grants you access to stdin, stdout, stderr and a thread to wait the child process when running another program. You can specify various attributes, redirections, current directory, etc., of the program as Process.spawn.
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::popen3 : pipes for stdin, stdout, stderr
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::popen2 : pipes for stdin, stdout
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::popen2e : pipes for stdin, merged stdout and stderr
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::capture3 : give a string for stdin. get strings for stdout, stderr
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::capture2 : give a string for stdin. get a string for stdout
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::capture2e : give a string for stdin. get a string for merged stdout and stderr
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::pipeline_rw : pipes for first stdin and last stdout of a pipeline
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::pipeline_r : pipe for last stdout of a pipeline
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::pipeline_w : pipe for first stdin of a pipeline
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::pipeline_start : run a pipeline and don't wait
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::pipeline : run a pipeline and wait